{"title":"Effect of optimum rejuvenator dosage on the performance of 100% recycled asphalt binder","authors":"Prakhar Aeron, Nikhil Saboo, Praveen Aggarwal","doi":"10.1007/s11043-023-09638-4","DOIUrl":null,"url":null,"abstract":"<div><p>Determination of optimum rejuvenator dosage is critical to the performance of 100% hot recycled asphalt mixtures. Further, at the optimum dosage, the rejuvenated binder is expected to have chemical and mechanical properties similar to the targeted virgin/control binder. The present study used waste engine oil (WEO) and tall oil (TO) to rejuvenate recycled asphalt pavement (RAP) binders obtained from two different sources. The optimum dosages of the rejuvenators were evaluated using different test procedures. The chemical, morphological, and performance characteristics of the RAP binders rejuvenated at the optimum dosages were studied. True fail temperature was identified as the most suitable parameter for estimating the optimum rejuvenator dosage. The optimum rejuvenator dosages of WEO were found to be 19% and 18%, respectively, for the two RAP sources considered in this study. The corresponding dosages for TO were estimated as 17% and 14%, respectively. Saturates-aromatics-resins-asphaltenes (SARA) analysis indicated that the rejuvenators were able to restore the chemical properties of the RAP binders, the degree of restoration being a function of the rejuvenator type and stiffness of the RAP binder. Results from atomic force microscopy (AFM) analysis confirmed that the rejuvenated binders showed the formation of new structures that were unique for different combinations of RAP binder and rejuvenator. Rutting and fatigue characteristics, evaluated using multiple stress creep and recovery (MSCR) and linear amplitude sweep (LAS) tests, respectively, improved after rejuvenating the RAP binders. In terms of rejuvenation and performance characteristics, TO showed better results in comparison to WEO.</p></div>","PeriodicalId":698,"journal":{"name":"Mechanics of Time-Dependent Materials","volume":"28 4","pages":"2451 - 2470"},"PeriodicalIF":2.1000,"publicationDate":"2023-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Mechanics of Time-Dependent Materials","FirstCategoryId":"88","ListUrlMain":"https://link.springer.com/article/10.1007/s11043-023-09638-4","RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"MATERIALS SCIENCE, CHARACTERIZATION & TESTING","Score":null,"Total":0}
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Abstract
Determination of optimum rejuvenator dosage is critical to the performance of 100% hot recycled asphalt mixtures. Further, at the optimum dosage, the rejuvenated binder is expected to have chemical and mechanical properties similar to the targeted virgin/control binder. The present study used waste engine oil (WEO) and tall oil (TO) to rejuvenate recycled asphalt pavement (RAP) binders obtained from two different sources. The optimum dosages of the rejuvenators were evaluated using different test procedures. The chemical, morphological, and performance characteristics of the RAP binders rejuvenated at the optimum dosages were studied. True fail temperature was identified as the most suitable parameter for estimating the optimum rejuvenator dosage. The optimum rejuvenator dosages of WEO were found to be 19% and 18%, respectively, for the two RAP sources considered in this study. The corresponding dosages for TO were estimated as 17% and 14%, respectively. Saturates-aromatics-resins-asphaltenes (SARA) analysis indicated that the rejuvenators were able to restore the chemical properties of the RAP binders, the degree of restoration being a function of the rejuvenator type and stiffness of the RAP binder. Results from atomic force microscopy (AFM) analysis confirmed that the rejuvenated binders showed the formation of new structures that were unique for different combinations of RAP binder and rejuvenator. Rutting and fatigue characteristics, evaluated using multiple stress creep and recovery (MSCR) and linear amplitude sweep (LAS) tests, respectively, improved after rejuvenating the RAP binders. In terms of rejuvenation and performance characteristics, TO showed better results in comparison to WEO.
期刊介绍：
Mechanics of Time-Dependent Materials accepts contributions dealing with the time-dependent mechanical properties of solid polymers, metals, ceramics, concrete, wood, or their composites. It is recognized that certain materials can be in the melt state as function of temperature and/or pressure. Contributions concerned with fundamental issues relating to processing and melt-to-solid transition behaviour are welcome, as are contributions addressing time-dependent failure and fracture phenomena. Manuscripts addressing environmental issues will be considered if they relate to time-dependent mechanical properties.
The journal promotes the transfer of knowledge between various disciplines that deal with the properties of time-dependent solid materials but approach these from different angles. Among these disciplines are: Mechanical Engineering, Aerospace Engineering, Chemical Engineering, Rheology, Materials Science, Polymer Physics, Design, and others.
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